Method HandleSyscall

Source/Windows/ARM64EC/Module.cpp:567–583

  }

  uint64_t HandleSyscall(FEXCore::Core::CpuStateFrame* Frame, FEXCore::HLE::SyscallArguments* Args) override {
    ProcessPendingCrossProcessEmulatorWork();

    // Manually raise an exeption with the current JIT state packed into a native context, ntdll handles this and
    // reenters the JIT (see dlls/ntdll/signal_arm64ec.c in wine).
    uint64_t FPCR, FPSR;
    __asm volatile("mrs %[fpcr], fpcr" : [fpcr] "=r"(FPCR));
    __asm volatile("mrs %[fpsr], fpsr" : [fpsr] "=r"(FPSR));

    auto* Thread = GetCPUArea().ThreadState();
    KiUserExceptionDispatcherStackLayout DispatchArgs {
      .Context = StoreStateToPackedECContext(Thread, static_cast<uint32_t>(FPCR), static_cast<uint32_t>(FPSR)),
      .Rec = {.ExceptionCode = STATUS_EMULATION_SYSCALL}};
    // PC is expected to hold the return address after the thunk, so skip over the INT 2E/SYSCALL instruction.
    DispatchArgs.Context.Pc += 2;
    JumpSetStack(KiUserExceptionDispatcher, reinterpret_cast<uintptr_t>(&DispatchArgs));
  }

  FEXCore::HLE::SyscallABI GetSyscallABI(uint64_t Syscall) override {
    return {.NumArgs = 0, .HasReturn = false, .HostSyscallNumber = -1};